258 
IOWA ACADEMY OF SCIENCE Vor. XXIX, 1922 
of the acorn. Acorns barrelshaped, obtuse at apex, about 2/3 of 
an inch to one inch in length, color medium yellowish brown. 
Germination hypogaeous. Scales of the young stem small, 
wooly pubescent, soon falling. Stem hairy. First leaf entire, 
smooth; second and third slightly dentate, prominently veined, 
pubescent on petioles and midrib, hairy on margin; Stipules red- 
dish, glandular, bearing slender hairs about 1/60 to 1/75 inch in 
length. Leaves become dark green above, paler beneath. The 
upper surface of the later leaves smooth, glaucous, pubescent on 
midrib ; Lower surface smooth. Outline rounded becoming lobed. 
Fig. 2. Trichomes of Quercus Gambellii ; (a) simple hairs from leaf margin, (b) from 
stem, (c) from stipules: glandular hairs and simple trichome 
Drawn by C. M. King 
Trichomes. The stem bears numerous minute hairs; simple, 
colorless sharp-pointed, about 1/60 inch in length. The hairs 
upon the stipules are larger (1/30 inch) clear, colorless, slender, 
pointed. 
The trichomes of the upper side of the leaf vary from simple 
slender sharp-pointed hairs to stellate trichomes with several (2-5) 
rays. Upon the under side of the leaves the hairs are simple. 
Along the margins of the leaves are numerous colorless hairs. 
Pasania densiflora Oerst. 
Specimens collected near Redlands, California, September, 1921, 
by L. H. Pammel. 
